Thermostatic switch for temperature indicators



. having residence in Evunson, in alle FEEDERXE G. VTHTTKNGTC-N, F EVANSTN, ILLINOS, ASSG'NR TO STEWART Evinr- Sta-ies, counijvy @ook and SLnie of Illinois, lieve invented certain nenv and usci` il 'morovcinents in Tnerniosetie Switches 'lcinjernt-nro ndioaors, of which tlie following is n specifie'frition, reference being had so lie esseren panying drnvvingn, 'forming a parl: thereof.

This inven'lion reletesi co e temperature indicator of tlie Seine general eype as inni sliown in my copending ep'plieesion, Serial No, 444,134-, filed February 11, 1921, and its object is "no provide en improved forni of tblreinioeacieelly operaed siviccii 1for such apperaius. Tt consiss oi cerein features and elements oi eonstrucl'ion iiereineiler described and Shown in the drawings as in-A dica/ced lay tine claim.

the drawings:

Figure 1 ie e somewhat diagrammatic oer- Speeive View of e portion of si niclor velfiiele showing e. iblierniostnieully operated einperniure indieato associnied with 'die engine licreof.

Figure 2 is a detail section tnlien :is indicnied at the line f3-2 on Fig' 1.

Fignre 8 is e vertical secr nel view o? flic tlierrnosiatio svvitcl' device, section 'bein teken lirengli lie casing eo :is to reveal Working *9e-rn Wiiliin.

Trnfion, a citizen of the Uniaed Figure is n fragmentary deleil Seeilion ine-fnelzen similarly to Figure lo allow :i fied censrnezinn.

'iin lie drnvvinge, the engine ei "gli i vehicle is indieaed al" 1 and lie Sig-nel Wliicli ilicdriver is 'warned m adi/i ienipernme conditions in 'lie eliovvn nl: es conveniently nionn rndiaor can. may lie undcre'tood alie signal device. 2. include@ ifm cen eleelric lamps. 3 and 4;ivliicli are iivelv lighted lo;y the tlicrinostnic de mounted Witliin ilie easing', 5, nfliicli ie Se cured egains; n Walla? lle engine :is Slimv in lligure 1. Ffen ineulniingl' mncrinl. Servesro eoni'ine lie engine licei wil'liin ilic cueinn. und permit il, ite aci upon The meelilinisrn lionsed in 'lie inner chamber, 7; any sniialile form of clamping lirzielzet, 2l, is provided for holding 'the easing, in 'posil/ion unen the engine sie Seen in Figure 3, the device includes ilirce binding posits for Ill-HCGQ, L'LINIS, A CRPORATION conne 'ione a- 9, 1G and 11. The 55 und ef, are both grounded at one sieni portion, 15. which may be :i separaee i5 part as shown driven into the lower end o* the part, L. 'ifi the stem. 15, is a, metallic member it will ','oe fully insulated from the eonduciere, 13 :ind 14. Figure El also shows on Said stein, 15, :i sleeve, 16, o? insulating 70 material. Tile upper conducting sleeve, 13. is eleciriceliy connected -by a spring con- 'b'nct nienilier, .17'. with the bindingT pos, 10, and "cli/ence wi'li die lmnp, 3: the lower Sleeve, 1&1, is similarly conneecd by e spring 7@ eonsncl', 1S, with llie binding post, 11, and thence ivin die lmnp, L1.

spirally cniled, ilierniosta, 19, is mounted with iis inner end fixed in n bracket, 9a, supported ov the binding post., 9, and in eleeiricel eonlucl therewith, While "lie 'free end or me tlierinoslziiic member, 19,

Curries :i liifnrencfl oontae brush. Q0, Whose arms embrace ilie insulating; Sleeve, 16, so long ne the engine, l. remains cold lout which 35 nre moved downwardly. first for Contact vi'tli ilie conductor Sleeve, 13, as the engine up ite :i normal running' temperature. if zilie engine einpernturc exceeds si safe limit die thermostat, 19, will uneoil still 90 furllier si, iis Contact arms. 21, downV upon lilie conductor cylinder. 14. Since the livin? y Q. which is electrically con- -Ul., 5'li iis lnncle, il?. wii'li lie Clif-:1'-

emlier, 19, and lirusli member, 2S, i one side ol die lenti-ery 21, tile g 'lic 'buttery being; grounded, el* brusli. 2G, with lie cyl- Stnnlislics a circuit through the p bushing,

ton, 22, of insulating completinga circuit at this point and by having different colored bulbs or being provided with differently colored screens through which their light is visible, or simply by being located at different points in the frame of the signal heed, 2 so that they can be readily distinguished from each other.

If the signal is intended primarily to warn the operator of excessive temperature there is no need to indicate the cooling of the engine below its normal safe Working tempereture; therefore when this occurs the contact brush arms, 20, are permitted to swing onto the insulating sleeve, 16, so that neither lamp will be lighted. rlfhe thermostetic movement in this direction is arrested by contact of a. stop button, 22, which is conveniently carried on the rivet which secures the brush, 20, to the thermostat member, i9; as this happens to strike against the binding post, 10, it is necessary to make the butmaterinl to prevent lightmg the lamp, 3.

For determining accurately the engine temperature at which the danger signal lamp, 4, is to be lighted, the p0st,'l2, curry# ing the contact sleeves, i3 and 1li, is -adjustable bodily in axial direction which is substantially the direction in which the-mmf:

Seid peet,

of the contact brush, 20, move.

threaded.

12, is threaded at, 23 to engage in e 24, fixed in the casing so that 'by turning the knurled head, 25, the pest may be moved up or down in the casing. The lower end portion is guided by e bracket, 26, epertured to encompass the sleeve, lli. A detent. spring, 27, is reereblyprovided bearing against the roug cned sui-fece oi the 'e lump, 3, l tenih p the insule; sleeve, i6, he c spensed with te shown Figure 15:, in which only two contact cy Aders, i3 and 146, ere carried,

d stein, l5, the ad'iust iis ceso isuleting niet l ciE lush, 2G, Y. with the sleeve,Y their travel sind. the l" lighted unless 'the c* out of by circuon the redu post, l2. in need :i1-ms A not slim-vn.

l cleiiuz--- :i member n contact! of' contacts ii' closely ed@ cngegemen, e further n ice comprising pensive 'to chen niovclil/fthereby. e 'plurali oth lm.

with the cout them. into l such conn neni 

